What was Nehemiah's adversary's name, Geshem or Gashmu? Nehemiah 2:19 and Nehemiah 6:6? (KJV)

Question

Answer

Nehemiah 2:19 (KJV) But when Sanballat the Horonite, and Tobiah the servant, the Ammonite, and Geshem the Arabian, heard it, they laughed us to scorn, and despised us, and said, What is this thing that ye do? will ye rebel against the king?
Nehemiah 6:6 (KJV) Wherein was written, It is reported among the heathen, and Gashmu saith it, that thou and the Jews think to rebel: for which cause thou buildest the wall, that thou mayest be their king, according to these words.

Both spellings are correct. Proper names are spelled differently in different languages. Nehemiah 2:19 is in Hebrew and Nehemiah 6:6 is Arabic.

"According to BDB the same termination -u is found in Nabatean [western Aramaic] proper names." (Orr, J., M.A., D.D. (1999). The International Standard Bible Encyclopedia: 1915 edition (J. Orr, Ed.). Albany, OR: Ages Software).